Toolholder



J. H. DRAKE TOOL HOLDER I Dec. 18, 1945.

' Filed Jun 15, 1944 2 Sheets-Sheet l Dec. 18,1945.

J. H. DRAKE TOOL HOLDER Filed June 15, 1944 2 Sheets-Sheet 2 28 1 1 I 29lo 1 71/ Patented Dec. 18, 1945 Jerry H. Drake,

Henry M. Herbene Thomasville, GaL, assignor to r, Thomasville, Ga.

Application June 15, 1944, Serial No. 540,389 9 Claims. (01. 29-975) Myinvention relates to holders for tools used i threading, cutting oif,key-seating, or the An important object of the invention is to pro- Videa tool holder of the above mentioned character, which will yield to.permit of the tool moving from the work, when too much material is beingtaken off or when an extra hard spot is encountered, or the like. I

A further object of the invention is to provide a tool holder of theabove mentioned character having means for holding the tool againstmovement at the selected cutting position, when the tension of thespring controlling the action of the tool is varied.

A further object of the invention is to provide a tool holder of theabove mentioned character which is strong and is capable of employing asufiiciently heavy or stiff spring.

A further object of the invention is to provide a tool holder of theabove mentioned character, which will have a yielding action, when doingheavy work, While the same may function as a rigid tool holder whendoing light work.

A further object of the invention is to provide a tool holder of theabove mentioned character which may be used by an inexperienced operatoror in connection with automatic machinery, without liability of breakingthe tool or cutter.

A further object of the invention is to provide adjustable pivot meansfor the tool carrying member, wherein the slack caused by wear can betaken up, so that the holder will be precise or true in operation.

A further object of the invention is to provide a tool holder soconstructed that the tool carryingmember or lever may have a long armacted upon by the spring, whereby the desired leverage is obtainable,for the proper operation of the device. 7

Other objects and advantages of the invention will be apparent duringthe course of the following description:

In accompanying this application and employed to designate same,

drawings forming a part of in which like numerals are like partsthroughout the Figure 2 is a plan view of the same, Figure 3 is afrontend elevation of the same, Figure 4 is a rear end elevation of thesame, Figure 5 is a transverse vertical section taken online 5-5 ofFigure 1, and 7 Figure 1 is a side elevation of a tool holderembodyingmy invention,

sleeve I4 is provided at standing projection l3. 7 ,is provided in itstop with a screw threaded open- ,ing H to receive a set-screw l8.

disposed upon formed integral with the side-arm l0 and pref' erablydisposed at a right angle thereto and is adapted to be clamped in latheor other machine.

The side-arm I0 is provided at its forward end with an upstandingprojection l3, preferably formed integral therewith and arranged at aright angle thereto in the same plan. The upstanding projection I3 isprovided with a horizontal bearing sleeve l4, preferably integraltherewith. This bearing sleeve is arranged at the top of theupstandingprojection l3 and extends transversely of the projection l3,preferably at a right angle thereto. The bearing sleeve M has acylindrical bore IS. The bearing sleeve l4 projects laterally beyond theupstanding projection l3, upon opposite sides of the same, and thebearing one end with a tapered face I 6, which is circular incross-section and decreases in diameter outwardly from the up- Thebearing sleeve It A pivoted tool holding member or lever I9 is spacedparallel relation thereto. This tool holding member or lever is providedbetween its ends and nearer its front end with an upstanding projection20, preferably formed integral therewith This.

and arranged at a right angle thereto. upstanding projection 20 isprovided at its top with a bearing sleeve 2|, preferably integraltherewith. 'This bearing sleeve has a tapered recess 22, increasing indiameter outwardly, to snugly receive the tapered face H5. The bearingsleeve 2| also has a tapered recess 23 increasing in diameter outwardly.The reduced ends of recesses 22 and 23 are in communication with a shortcylindrical bore 24 of the bearing sleeve 2|, as

shown. At'its top, the bearing sleeve 2| has a hole 25 for receivingalubricant and leading to the bore 24.

The numeral 26 designates a cylindrical pin which fits snugly within thecylindrical bore 15 and this pin is provided at one end with a head 21,which is circularin cross section, and tapers the tool post 12 of a oneside of the side-arm to, in

inwardly, and is adapted to snugly fit within the tapered recess 23. Thepin 26 is provided with an upper flat 28, for clamping engagement withthe set-screw l8. The pin 26 has a screwthreaded extension 29, forengaging with a nut 30. By manipulating the nut 30 the slack or playbetween the portions l6 and 2|; and 21 and 2| may be properly taken up,so that the tool carrying member or lever I3 is accurately pivotallysupported at the top of the projection 20, and after this adjustment ismade, the pin 26 is clamped in the selected adjusted position by theset-screw I 8. The tool holding member or lever It therefore has a shortarm 3| projecting forwardly of the pin or pivot-26 and a long arm 32projecting rearwardly of the same. The

the tool 34 moves from the work, and relieves the strain upon the tool,thus preventing injury to the tool or the work. Should it be desired tochange the tension of the spring 42 while the device is in operation andthe stop screw 48 is engaging the side-arm [0, the screw 40 is turned toincrease the tension upon the spring, but this arm 32 may therefore besufi'iciently long to produce the desired leverage.

The short arm 3| is provided with an opening 33, for receiving the tool34, arranged to engage the work 35. This tool is clamped in place by aset-screw 36,

At its rear end the member or lever 49 is provided with an upstandingarm 37, preferably formed integral therewith. This upstanding arm isprovided at its top with a horizontal or lateral extension 38, providedwith a head 39, having a vertical screw threaded opening for receivingan adjusting screw 40. This adjusting screw is arranged to engage a heador disk 4| applied to one end of a heavy stifi compressible coil spring42. The head or disk 4| has a boss 43 extending into the bore of thecoil spring 42. At its lower end, the coil spring 42 engages a lateralextension 44 of the member or lever 19- which is preferably formedintegral therewith. The extension 44 carries an upwardly projecting boss45, extending into the bore of the coil spring 42.

The tool holding member or lever I9 is provided with a stop device, forretaining the tool 34 in the selected cutting elevation when the tensionof the spring 42 is changed or adjusted by manipulating the screw 40.This stop device comprises a horizontal arm 46, rigidly secured to themember or lever I9 between the projection 28 and the spring. 42. The arm46 is arranged above the arm 32 and is preferably formed integral withthe upper edge of the arm 32. The horizontal arm 45 extends over theside-arm It, as shown. The arm 46 has a vertical screw threaded opening41 receiving an adjustable stop-screw 48, to be locked in the selectedadjusted position by a lock nut 49. This set-screw is arranged to engagethe upper edge of the side arm it, as shown.

The operation of the device is as follows: The shank H is clamped withinthe tool post I2 of the lathe or like machine and the tool 34- isbrought to the selected cutting elevation, which is determined by theadjustment of the stop screw 48 engaging the side-arm Hi. By adjustingthe stop screw 48 the elevation of the tool 34 may be varied. The coilspring 42' is now placed under suitable tension by turning the screw4!]. When the tool 34 is to do heavy work, the spring 42 is placed underhigh tension. Under normal cutting conditions, the spring 42 will retainthe arm 32 in the lowered position and clamp the stop screw 48 againstthe side-armi il. However, should the tool 34 out too deep or take offtoo much material, or encounter an extra hard spot in the work, thetension of the spring 42 or lever 19 will swing upon'the pin26, wherebyincreased tension cannot move the member or lever [9 with respect to thesaid arm 10 and hence the elevation of the tool 34 is not varied. Whenthe device is used for light work, the tension of the spring 42 may besuch that it will never be overcome, in which event the device will thenoperate as a rigid tool holder.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarious changes in the shape, size, and arrangement of parts may beresorted to without departing from the spirit of my invention or thescope of the subjoined claims.

Having thus described my invention, what I claim is:

l. A tool holder, comprising a side-arm provided between its ends with alateral shank to be secured to a tool post, a tool holding memberdisposed upon one side of the side-arm and pivota'lly mounted betweenits ends upon the sidearm near one end of the side-arm the tool holdingmember having short and long arms extending upon opposite sides of itspivot, an arm mounted upon the opposite end of theSidei-arm, and aspring engaging the last named armand the rear end of the long arm ofthe tool holding member.

2. A tool holder, comprising a side-arm having a laterally extendingshank to be secured to a tool post, an upstanding projection carried bythe side-arm near one end thereof, a lever disposed upon that side ofthe side-arm which is remote from the Shank, an upstanding projectionsecured to the lever near one end thereof, means pivotally connectingthe upper ends of the projections. an upstanding arm secured to thesidearm near its opposite end and having a lateral projection extendingover the lever, a compressible coil spring arranged between the lateralprojection and lever, and means to secure a tool to the lever.

3. A tool holder, comprising a side-arm to be secured to a tool post orthe like, a tapered element secured to the side-arm, a bearing sleevehaving a. tapered. recess to pivotally receive the tapered element,adjustable means to draw the bearing sleeve axially upon the taperedelement. a lever carried by the bearing sleeve, a spring acting againstthe lever and side-arm, and means to secure a tool to the lever. a

4. A tool holder, comprising a side-arm, means to secure the side-arm toa tool post or the like. a bearing sleeve secured'to the side-arm andhaving a tapered face, a second bearing. sleeve having tapered recessesin its ends, one tapered recess receiving the tapered face. a pinarranged within the first bearing sleeve and having a ta-- peredv headarranged within the other tapered recess, means to adjust the pinaxially, means, to clamp the pin in the selected adjusted position, anarm carried. by the last named sleeve, a spring acting against the armand side-arm, and mean; to secure a tool to the arm.

5. A tool holder, comprising a generally horizontal side-arm providedwith a shank to besecured to a tool post, a generally horizontal toolholder arranged upon one sideof the side-arm and pivotally mounted uponthe side-arm to turn upon a transverse axis with relation to the sidearm, anarm secured to the side-arm and having an extension projectingacross the tool holder,v

and a spring arranged between said extension and tool holder.

6. A tool holder, comprising a generally horizontal side-arm providedwith a shank to be secured to a tool post, a generally horizontaltoolholding member arranged upon one side of the side-arm, a pivotelement arranged near one end of the side-arm and extending transverselythrough the side-arm and tool-holding member,

an upstanding arm secured to the side-arm near its opposite end andprovided with a lateral extension extending over the tool-holdingmember, and a compressible coil spring arranged between the lateralextension and the tool-holding member.

' LA tool holder, comprising a side-arm to be secured to a tool post orthe like, a lever arranged near the side-arm and extendinglongitudinally thereof, a pivot element extending transversely of theside-arm and lever for pivotally connecting the side-arm and lever andarranged near one I end of the lever, means arranged near the pivotelement for securing a. tool to the lever, a spring engaging the levernear its opposite end, adjustable means mounted upon the side-arm andengaging the spring to regulate its tension, and a stop element securedto the lever and arranged to engage the side-arm to limit the movementof the lever upon the transverse pivot element.

its tension, and an adjustable stop mounted upon the lever and arrangedto engage the side-arm to limit the movement of, the lever upon thetransverse pivot element.

9. A tool holder, comprising a side-arm provided with a laterallyextending shank to be se- 7 cured to a tool post, a lever disposed uponone side of the side-arm and extending longitudinally thereof, a pivotelement connecting the lever and side-arm and extending transversely ofthe lever and side-arm and arranged near the forward end of the lever,said lever being provided near its forward end with means for holding acutter, said lever having a long arm, a spring acting upon the rear endsof the side-arm and lever, and a bolt having screw-threaded engagementwith the lever and arranged to engage with the side-arm and serving asan adjustable stop.

JERRY H. DRAKE. V

